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Cypress Semiconductor CY2291 manual

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Table of contents for the manual

  • Page 1

    CY2291 Three-PLL General Purpose EPROM Programmable Clock Generator Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document #: 38-07189 Rev . *C Revised September 16, 2008 Features ■ Three integrated phase-lo cked loops ■ EPROM programmability ■ Factory-programmable (CY2291) or field-pr[...]

  • Page 2

    CY2291 Document #: 38-07189 Rev . *C Page 2 of 12 Pinout s Figure 1. CY2291- 20-pin SOIC Pin Definitions Name Pin Number Description 32XOUT 1 32.768-kHz crystal feedback. 32K 2 32.768-kHz output (always active if VBA TT is present). CLKC 3 Configurable clo ck output C. VDD 4, 16 V oltage supply . GND 5 Ground. XT ALIN [1] 6 Reference crystal input [...]

  • Page 3

    CY2291 Document #: 38-07189 Rev . *C Page 3 of 12 Operation The CY2291 is a third-ge neration family of cl ock generators. The CY2291 is upwardl y compatible with the industry standard ICD2023 and ICD2028 and continu es their tradition by providing a high level o f customizable features to meet the diverse clock generation needs of modern motherbo [...]

  • Page 4

    CY2291 Document #: 38-07189 Rev . *C Page 4 of 12 Maximum Ratings (Exceeding maximum ratings may shorten the useful life of the device. User gui d el i ne s are not tested.) Supply V oltage ............... .............. .............. ....–0.5V to + 7.0V DC Input V oltage ...... ........... ... ... .. .............. ....–0.5V to + 7.0V S torag[...]

  • Page 5

    CY2291 Document #: 38-07189 Rev . *C Page 5 of 12 Electrical Characteristics, Commercial 3.3V Parameter Description Conditions Min. Ty p . Max. Unit V OH HIGH-Level Output V oltage I OH = 4.0 mA 2.4 V V OL LOW -Level O utput V oltage I OL = 4.0 mA 0.4 V V OH–32 32.768-kHz HIGH-Level Output V oltage I OH = 0.5 mA V BA TT 0.5 V V OL–32 32.768-kHz[...]

  • Page 6

    CY2291 Document #: 38-07189 Rev . *C Page 6 of 12 V IH HIGH-Level Input V oltage [9] Except crystal pins 2.0 V V IL LOW -Level I nput V oltage [9] Except cryst al pins 0.8 V I IH Input HIGH Current V IN = V DD –0 .5V < 1 10 μ A I IL Input LOW C ur rent V IN = +0.5V < 1 10 μ A I OZ Output Leakage Current Three-state outputs 250 μ A I DD V[...]

  • Page 7

    CY2291 Document #: 38-07189 Rev . *C Page 7 of 12 t 10B Lock T ime for UPLL and SPLL Lock T ime from Power Up < 0.25 1 ms Slew Limits CPU PLL Slew Limits CY2291 8 100 MHz CY2291F 8 90 MHz Switching Characteristics, Commercial 3.3 V Parameter Name Description Mi n. Ty p . Max. Unit t 1 Output Period Clock output range, 3.3V operation CY2291 12.5 [...]

  • Page 8

    CY2291 Document #: 38-07189 Rev . *C Page 8 of 12 Switching Characteristics, Industrial 5.0V Parameter Name Description Mi n. Ty p . Max. Unit t 1 Output Period Clock output range, 5V operation CY2291I 1 1.1 (90 MHz) 1 3000 (76.923 kHz) ns CY2291FI 12.5 (80 MHz) 1 3000 (76.923 kHz) ns Output Duty Cycle [1 1] Duty cycle for output s, defined as t 2 [...]

  • Page 9

    CY2291 Document #: 38-07189 Rev . *C Page 9 of 12 t 6 Output Enable Ti m e Time for output to leave three-st ate mode after SHUTDOWN /OE goes HIGH 10 1 5 ns t 7 Skew Skew delay between any identical or related outputs [3, 12, 15] < 0 .25 0. 5 ns t 8 CPUCLK Slew Frequency transition rate 1.0 20.0 MHz/ms t 9A Clock Jitter [14] Peak-to-peak period [...]

  • Page 10

    CY2291 Document #: 38-07189 Rev . *C Page 10 of 12 Switching W aveforms SELECT CPU OLD SELECT NEW SELECT STABLE F old F new t 8 &t 10 Figure 5. CPU Frequency Chang e T est Circuit Ordering Information Ordering Code Package T ype Operating Rang e Operatin g V oltage CY2291FI [16] 20-Pin SOIC Industrial 3.3V or 5.0V Pb-Free CY2291SXC–XXX 20-Pin[...]

  • Page 11

    CY2291 Document #: 38-07189 Rev . *C Page 1 1 of 12 Package Diagram Figure 6. 20-Pin (300 MI L) SOIC Package Outline 51-85024 *C [+] Feedback[...]

  • Page 12

    Document #: 38-07189 Rev . *C Revise d September 16, 2008 Page 12 of 12 Pentium is a registered trademark o f Inte l Corporation. CyClocks is a trademark o f Cy press Semiconductor Co rporation. All produ ct and comp any names me ntioned in this document are trad emarks of their respecti ve holders. CY2291 © Cypress Semicondu ctor Corpor ation, 20[...]